Tantalum superconducting resonators show a persistent, non-equilibrium quasiparticle density at millikelvin temperatures that is about three times lower than in niobium nitride at the same normalized temperature.
Engineering high-q superconducting tantalum microwave coplanar waveguide resonators for compact coherent quantum circuit,
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On-chip microwave sensing of quasiparticles in tantalum superconducting circuits on silicon for scalable quantum technologies
Tantalum superconducting resonators show a persistent, non-equilibrium quasiparticle density at millikelvin temperatures that is about three times lower than in niobium nitride at the same normalized temperature.